The Three Emperors League was a defensive alliance formed in 1872 between the German Empire, Russian Empire, and Austro-Hungarian Empire to maintain the status quo in the Balkans and isolate France diplomatically. It was an important part of Bismarck's system of alliances that helped unify Germany but also contributed to rising tensions after it dissolved. By rejecting treaty renewal in the 1890s, Germany lost leverage over Austria and increased Russian insecurity, sowing seeds for future conflicts.